Adding machine



G. J. BARRETT ADDING MACHINE Dec. 16, 1930.

Original Filed Aug. 14, 1925 4 Sheets-Sheet 1 Y INVENTOR L G/e/m[Barrell ATTORNEYS G. J. BARRETT Dec. 16, 1930.

ADDING MACHINE Original Filed Aug. 14, 9

4 Sheqts$heet 2 INVENTOR 6/9111? J.' Barre/l.

ATTORNEYS G. J. BARRETT ADDING MACHINE Dec. 16, 1930.

4 Sheets-Sheet 3 Original Fi led Aug &

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m. R r F.. m m W m m m N N Y 63 wa m W. 7 a a P Q Q Dec. 16, 1930. G. J.BARRETT ADDING MACHINE Original Filed Aug. 14, 1925 4 Sheets-Sheet 4INVENTOR I 616171? JBarrelZ.

' ATTORNEYS Patented Dec. 16, 1930 UNITED STATES GLENN J. BARRETT, OFEVANSTON, ILLINOIS, ASSIGNOR TO PORTABLE ADDING MIA- PATENT OFFICE CHINECOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS ADDING MACHINEOriginal application filed August 14, 1925, Serial No. 50,219. Dividedand this application filed July 26, 1927. Serial No. 208,578.

This invention relates more particularly to improvements in the keyboardfor a key-set adding machine of the type shown in my application forpatent filed August 14. 1925, Serial No. 50,219, and of which thisapplication is a division.

One of the main objects of the invention is to improve the keyboardunit: and particularly to condense the keyboard so that I am enabled toplace the keys closer together and use key caps smaller than the usualstandard keys, without interfering with the ease of operation of thekeyboard.

Another important object of the invention is to so construct andassemble the entire keyboard unit in a sub-frame that it may be readilybodily removed from the machine frame without disarranging any of theremaining parts of the machine.

Another object of the invention is to include in the removable keyboardunit many associated. parts which are ordinarily mounted in the mainframe of an adding machine.

Another object of the invention is to arrange all of the associatedelements carried by the keyboard unit sub-frame so that no positiveconnections are required between the various mechanisms of the keyboardunit and the mechanisms with which they cooperate. in the body of themachine, such co-opating parts being subject to contact engagement only.

In the drawings:

Fig. 1 is a partial longitudinal vertical sectional view of an addingmachine showing the invention applied thereto:

Fig. 1 a detail sectional view showing one key depressed and latched;

Fig. 2 a detail sectional view showing the latch strip locking bailraised out of engagement with the latch strips;

Fig. 3 a plan view of the keyboard unit detached from the machine;

Fig. 4 a bottom plan view of the keyboard unit detached, parts beingbroken away to more clearly show the construction;

Fig. 5 a transverse sectional view of a part of the machine showing thekeyboard unit in position in the machine frame;

Fig. 6 a detail plan view showing the arrangement of the stop slideswhich cooperate with the key stems;

Fig. 7 a. partial side elevation of an adding machine showing theinvention applied thereto;

Fig. 8 a detail view showing the operation of the latch strip releasingmeans;

Fig. 9 a similar view showing the latch strip releasing means adjustedfor repeatoperatlons;

Fig. 10 a perspective view of the rear end of the keyboard unit, partsbeing broken away to more clearly show the construction;

and i Fig. 11 a view similar to Fig. 10, taken from the opposite side ofthe keyboard unit.

Referring to the drawings and particularly to Figs. 1 and 5, it will beseen that the machine is provided witha base plate 1, to which rubberfeet 2, indicated in Fig. 1, are preferably secured, the base platebeing, in the present instance, formed of thin sheet metal. This baseplate is provided with transversely extending rectangular bars near thefront and rear ends of the machine, one of which is indicated at thefront of the machine in Fig. 1 of the drawings. Frame side plates 5 and6 are secured to the ends of the respective transverse bars by suitablefastening means, the frame late 5 being on the right side of the mac incand the frame plate 6 on the left side. The frame plates 5 and 6 areadapted to support the entire keyboard mechanism, as hereinafterexplained. The cover casing 8 is adapted to enclose the machine and isheld in place by suitable fastening means. The side plates 5 and 6preferably extend along the base plate 1 to support certain transverserods and shafts, hereinafter referred to. The upper edges of the sideplates incline upwardly and rearwardly at an angle ofapproximately tothe horizontal, thereby conforming to the plane of the keyboard, whichis supported thereby as hereinafter pointed out. 'The upper edges of theside plates drop to a lower level back of the keyboard, the arrangementbeing such as to inclined portions of the side frame plates 5 and 6, ismore particularly shown, detached from the machine, in Figs. 3 and 4. Itcomprises a top plate 12, the lateral edges of which are provided withnotches 13 at .its

- four corners adapted to cooperate with lugs 14 on the respective frameside plates 5 and 6, as indicated in Figs.3 and 7. This mounting notonly helps hold the keyboard unit in place but is adapted to position itin the machine in proper relation for the parts to cooperate with theadding unit and control mechanism. The top plate 12 of the keyboard unitis riveted or otherwise secured to side plates 15, which extend downwardfrom the underside thereof, as indicated in Fig. 5 of the drawings, andare adapted for the sup ort of various associated parts of the key oardunit. The top plate 12 and the side plates 15 form a sub-frame designedto carry all of the parts of the keyboard unit and to be removablysecured in the main frame. Two removable rods 16, extending transverselythrough the frame side plates 5 and 6 and the side plates 15 of thekeyboard unit and located under the top and bottom edges of the topplate 12, are adapted to detachably secure the keyboard unit in place onthe side plates of the machine, as indicated in Figs. 1 and 7 of thedrawings. The rods 16 are preferably held in place in the frame bysealing clips 17 forced into annular grooves in the ends of the rods, asindicated in Fig. 7. The keyboard comprises a plurality of rows of keysfrom zero to nine inclusive, provided with key caps 18 of relativelysmall diameter, secured to the upper ends of key stems 19, which passthrough suitable transverse slots in the top plate 12 of the keyboardunit, as indicated in Fi s. 1 and 5. In my improved construction, t ekey caps 18 are made smaller in diameter than in standard machines, soas to facilitate mounting the rows of keys, and the keys in each row,closer together, to thereby provide a condensed beyboard withoutinterfering with the ease of fingering. The key stems 19 are referablypunched from sheet metal in two orms, one with a central tail or stopfinger 20 and the other with a tail or stop finger 21, located at oneedge, so that by reversing the latter type of key stems 19, the tails orstops 20-21 in each row of keys will be in three parallel lines, asindicated in Fig. 5. The lower tail ends of the ke s 19 are supported inbridge strips 22, whicli are provided with three lines of perforationsfor the passage therethrough of the key stop fingers 20 and 21, as shownin Fig. 4 of the drawings. The bridge strips 22 which are U-shaped incross section are preferably supported from the side plates 15 of thekeyboard unit by transversely extending removable rods 23 passingthrough holes in the side plates and through holes in ears at the endsof the respective bridge strips. The ends of the rods 23 are formed withannular grooves in which are slipped spring clips 23 similar in form toclips 17 (Fig. 7). These clips engage the outer sides of the plates 15.By removing the clip 23 the rods 23 may be withdrawn and the bridgestrip released. The bridge strips 22 are preferably held in properspaced position transversely of the keyboard unit, by notches 25 intransversely extending comb or guide plates 26, mounted respectivelybetween the front and rear ends of the side plates 15 and supportedtherein in any suitable manner.

The respective key stems 19 are provided with elongated central openingsat 27, through which key latch strips 28 extend, the respective latchstrips being provided with beveled notches and formed with latch dogs29, cooperating with a detent 30, (see Fig. 5) formed in the respectivekeys 19 by another punched hole 31, above the opening 27. The latchstrips 28 are properly spaced transversely of the keyboard unit byslidably mounting the ends thereof in slots in the guide plates 26. Thelatch dogs 29 are beveled on their upper edges and provided withundercut notches adapted to engage the key detents 30, when the keys aredepressed. When akey is depressed the latch strip will be moved towardthe front of the machine until the detent 30 is engaged by the undersideof the latch dog 29. In this manner, the keys are held in depressed'orset position, but if, after a key is depressed, another key is depressedin the same row, the first key will be released and returned by itsspring to normal position, thus forming a flexible keyboard.

The undercut notches of the beveled latch dogs 29 are of shallow depthso that when the notches engage the detents 30 of the keys, the latchstrips 28 will not return fully to their original positions, therebypositioning the associated stop levers (37) hereinafter referred to outof engagement with the corresponding adding units.

The side plates 15 of the keyboard unit subframe are preferably securedtogether near their lower edges by two stay rods 32, which arepreferably riveted in place and located below the latch strips28 inposition to support the latter and permit free sliding movement thereof.In order to restore depressed keys to normal position, springs 33 areprovided. These springs are preferably coiled about rods 34, extendingtransversely of the rows of keys, betwien alternate keys of the rows,and the ends of the springs extend in opposite directions and areadapted to pass through the holes 31 in adjacent key stems 19. In thismanner, a single spring is adapted to operate two keys, thereby reducingthe number of springs required.

The side plates 15 of the keyboard unit subframe are provided withrearwardly projecting arms 35 forming the support for a trans verselyextending shaft 36, lying below the rear ends of the latch strips 28,for supporting a plurality of stop levers 37, pivotally mounted thereon.The stop levers 37 are carried on hubs 38 (Fig. 4) which form spacingelements therebetween, on the shaft 36, and maintain the upper ends 39of the levers in the same spaced relation as the latch strips 28 withwhich they are adapted to cooperate. The upper ends 39 of the stoplevers 37 lie alongside the rear ends of the latch strips 28 and areprovided with laterally projecting ears 40, which are adapted to engagewith the ends of the latch strips, as indicated in Figs. 1 and 3. Thestop levers 37 are also provided with rearwardly projecting fingers 41,between which and holes 42 in the respective latch strips 28, doubleacting springs 43 are connected for mutually holding the cars in contactwith the ends of the respective latch strips and for moving the latchstrips toward the rear to effect latching of set keys or, when no keysare set, the springs will hold the latch strips 28 and stop levers 37 innormal position with the latter in position to engage the stops ordetent teeth on the adding units.

The transversely extending rod or shaft 36,

' supporting the stop levers 37, forms the pivotal support for a yoke orrock bail 44, adapted to lie immediately back of the rear ends of thelatch strips 28 and to limit the rearward movement of the latter underthe action of their springs 43. The position of the bail 44 isdetermined by a forwardly extending arm 45 engaging the end of one ofthe bridge rods 23, see Fig. 10, thereby limiting the rearwardmovementof the bail 44 and of the latch strips 28, under the pressure ofthe springs 43.

The latch strip rock bail 44 is provided with rearwardly extending arms44 for pivotally supporting thereon a small auxiliary yoke or rock bail46. pivoted on a shaft 47. as indicated in Figs. 1 and 7 of thedrawings. The auxiliary bail 46 is normally held against a shoulder 48on the right side of the latch strip bail 44, as shown in Figs. 8 and 10of the drawings, by a spring 49, extending between the two bails, andthe right end of the auxiliary bail 46 is provided with a depending arm50, carrying a laterally extending pin 51, adapted to be engaged by aroller 221 hereinafter referred to in connection with the handlemechanism, for operating the latch strip rock bail 44 to move all of thelatch strips forward, and thereby release any set keys at the end of thereturn stroke-of the handle.

In the repeat operation on machines of this character, it is understoodthat the number set upon the keyboard is retained, while the handle isoperated several times to repeatedly add the same number, and for thispurpose, the auxiliary bail 46 is adapted to be moved toward the rearand held in that position for the repeat operation. In'my improvedconstruction this is accomplished by a simple. mechanism comprising abellcrank-shaped repeat key lever 52, pivotally mounted on a screw 53(see Fig. 7) on a forwardly and upwardly projecting arm 44 on the leftend of the rock bail 4-4. The repeat key lever 52 is held in frictionalcontact with the bail arm 44 by means of a spring 54, extending'betweenthe head of the pivot screw 53 and the side of the lever, as indicatedin Figs. 3 and 4 of the drawings. The rearwardly extending arm of thelever 52 is provided with a cam surface at 55, adapted to engage theauxiliary rock bail 46 and force it rearward against the action of itsspring 49, and at the upper end of the cam surface a notch at 56 isprovided, which will limit the movement of the repeat key toward therear and, by engaging the edge of the bail 46, will retain the latter inposition for the re eat operation. In the repeat position 0 the repeatkey lever 52, as shown in Fig. 9, the pin 51 on the arm 50 of theauxiliary bail 46 will be held out of operative position, and,therefore, the latch strip rock bail 44 will notbe actuated by thehandle mechanism to release any keys set in the keyboard.

In repeat operations it frequently happens that after the number set upin the keyboard has been repeatedly added the required number of times,the depressed keys remain in depressed position because the operator didnot release the repeat key before the last re peat operation of thehandle. Therefore, it is necessary to manuall release the set keys, andthis is adapted to e accomplished in a simple manner, in my improvedmachine, by mounting the repeat key lever 52, as previously explained,on the latch strip rock bail 44, and providing the arm 44", on which therepeat lever 52 is pivoted, with a laterally extending ear 57 adapted tobe engaged by the upwardly extending arm of the repeat key which, asindicated in Figs. 1, 7 and 11 of the drawings, is provided with thefinger button 58. Thus, by a continuing pull on the repeat key button58, the lever 52 is moved to release the auxiliary bail 46 from thenotch'56, thereby permitting the spring 49 to restore the bail to normalposition, and the repeat lever, b engaging the ear 57 as the lever isdrawn orward, will rock the latch strip bail 44 to release the set keysof the keyboard.

During the operation of the machine, adding unit stop slides,hereinafter referred to,

' e on a. lever arm forming part of the mechanism are adapted to engagethe lower extremities or tail stops of the set keys and the impact,particularly during the repeat operation, is apt to jar the depressedkeys so that there is a possibility of jarring the latch strips looseand permitting release of the keys. In order to prevent accidentalrelease under these circumstances, the latch strips 28 are preferablyprovided with notches 59, near their rear ends, with which a lockingbail 60 is adapted to cooperate for preventing movement of the latchstrips, after the handle has been started on its forward stroke.Thelocking bail 60 is pivotally mounted by arms 61, see Figs. 1, 2 and11, on the ends of the rearmost key spring supporting rod 34 mounted inthe side plates 15 of the keyboard unit sub-frame, as will be seen inFig.- 4 of the drawings. The locking bail 60 is preferably provided witha downwardly and rearwardly extending arm 62, adapted to cooperate witha pin 63, carried operated by the handle. The arrangement, as'will beseen in Figs. 2, 4 and 11, is such that, in normal position of thehandle, the pin 63, by engaging the lower end of the arm 62, lifts andholds the locking bail 60 out of engagement with the notches 59 in thelatch strips 28, thereby permitting keys to be freely set. However,after the handle has started and is on its forward stroke, the pin 63will be moved out of engagement with the arm 62, thus permitting thelocking bail 60 to engage the notches of the latch strips and preventaccidental movement thereof. The bail .60 serves to also lock the keysthat are not depressed and secures them against accidental operationwhen the handle movement is started. When a key is depressed its latchstrip is forced forwardly slightly and it then snaps back over the crossbar in the key stem. This backward movement of the latch strip issufficient to again position the lockattention is called to an importantminor improvement. The key stem tails or stop fingers 20 and 21 arerather delicate and, in removing the keyboard unit from the ma.-

- chine, these tail stops are likely to be bent,

if any of the keys happen to be in depressed position when the attemptis made to remove the keyboard. Therefore, 9. depending arm 64 on theright side of the key latch releasing bail 44 is provided with alaterally projecting stud 65 (see Figs. 9 and 10) which is adapted tocooperate with a notch at 66 in the frame plate 5 on the right side ofthe machine, so that upon lifting the front end of the keyboardunit,'which is necessary when removing the same from the frame of themachine, the stud 65, by engaging the frame plate, will move the rockbail 44 toward the front of the machine, thereby moving the key latchstrips 28 to release any keys that may have been depressed.

Adding 'u/m'ts.The adding units are rotatably mounted upon the mainshaft 68, to which the handle is secured, as hereinafter described, andeach comprises a driver element 69, carrying type segments 70 whichextend toward the rear of the machine, as indicated in Fig. 1 of thedrawings. The type segments are formed as narrow rolled type strips,concentrically mounted on arcuate flanges on the driver elements 69, thetype being fixed thereon and adapted to be printed by movement of theplaten against the type segments, as described in my application, SerialNo. 50,219. The type segments or driver elements 69 of the adding unitsare provided with upwardly projecting stop lugs 71, adapted to cooperatewith ears 72 bent over on the ends of the stop levers 37, here inbeforereferred to, and adapted to be positioned by the latch strips 28 whenkeys in the keyboard are depressed. The arrangement is such that whenthe keys are set, the ears 72 are lifted sufiiciently to clear theendsof the stop lugs 71, thereby permitting rotation of the addingunits, when the handle is operated. The type segments and adding unitsare preferably mounted in condensed form, that is, to correspond to thespacing of the printed numbers, and, since the rows of keys are spacedfurther apart than is reqmred from the type segments, the rear ends ofthe stop levers 37 are bent inward, as indicated in Figs. 3, 4 and 11,to bring the ears 72 thereof into cooperative relation with the addingunit stop lugs 71. The disc-like driver element type segments 69-7O aresecured to hubs 73, which are preferably formed with ulley grooves, aswill be seen 1n dotted lines in F1 1, and driving springs 74 passover-the hu s and engage pins 75, secured to the respective drivingelements 69. The opposite ends of the springs .74 are carried forwardand anchored in holes 76 in a cross bar 77, extending between the sideplates 5 and 6, and supported thereby, as indicated in Fig. 1 of thedrawings. By this arrangement, it will be seen that the driving elements69, and hence, the adding units, are urged forward by the action of thesprings 74, but are normally prevented from such forward movement by abail as described in said application, Serial No. 50,219. The units maybe freed for such forward movement by the depression of the keys in thekeyboard which would lift the stop levers 37.

The hubs 73 of the type segment driving elements 69 extend a shortdistance on the right side of the latter to form bearing shoulders 78,upon which adding sectors 79 are rotatably mounted. The adding sectorsare preferably spaced slightly from the asso ciated driver-type segmentdiscs 69 and are provided with elongated slotted holes 80, through whichheaded rivets 81 extend, thereby securing the adding sectors to therespective driving elements for independent rotation to the extent ofone unit. The driving elements 69 and the adding sectors 7 9 areresiliently connected together by springs 82, substantiallyeas indicatedin Fig. 1, the arrangement ing such that the spring 82 is adapted tomove the adding sectors for transfer of the tens, as fully described inmy said application, Serial No. 50,219.

The movements of the adding units, after the stop levers 37 have beenpositioned by setting keys representing the number to be added, areadapted to be determined by the tail stops of the respective set keys.For this purpose, the adding sectors 7 9 are provided with pivot studs83 to which links 81 are pivotally connected, as indicated in Fig. 1,the opposite ends of the links 8i being connected by bolts 85, with stopslides 86, which are provided with stop ears or lugs 87, adapted toengage the tail stops 2021 of the keys 19. It has been previouslypointed out that the adding units are mounted in condensed form,corresponding to the spacing required between the type segments and,therefore, the links 84 are bent or fan outwardly from their connectionto adding sectors at their forward ends to their connections with thestop slides 86 which correspond with the spacing between rows of keys.The stop slides 86 are provided with elongated slots at 88 and 89cooperating with annular grooves 90 in transversely extending rods 91,supported in the frame plates 5 and 6, as shown in Fig. 1; thearrangement being such that the stop slides 86 are held in proper spacedrelation, and are freely slidable for differential positioning of therespective adding units according to numbers set up on the keyboard. Atransverse rod 91' is supported in the frame plates 5 and 6 forwardly ofthe forward ends of the links 84. This rod 91" serves as an abutment forthe links and prevents their being accidentally moved out far enough todisengage the slots 89 from the rod 91.

An important feature of my improvement in association with the linkconnections 84 i and the stop slide strips 86, is to provide for ablymounting the pins or bolts 85 of the connecting links 84 in the forwardends of the slots 88 of the respective stop slides 86, so as to permitrelative longitudinal movement therebetween. The pins or bolts 85 areheld normally at the forward ends of the respective slots 88 by means ofsprings 92, connected to fingers 93 on the links 84, and to pins 94 inthe forward ends of the respective stop slides 86, as will be seen moreparticularly in Fig. 1 of the drawings. This ararngement ated addingsector 79, which, as hereinafter described, is adapted to be returned tonormal position when the driving elements 69 are returned by the pick-upbail 294 (Fig. 1), but this would merely stretch the spring 92 and assoon as the return of the handle releases the key the spring will snapthe stop slide back to normal position.

It has been previously pointed out that, in order to condense thekeyboard and at the same time provide for a greater movement of the stopslides 86 than the distance between the keys in a row, the tail stops ofthe keys are arranged in three parallel lines. This arrangement is ofadvantage in that it requires less accuracy in adjusting the relationbetween the parts. Accordingly, the stop ears or lugs 87 on the stopslide strips 86 are correspondingly arranged in three lines, asindicated in Figs. 5 and 6 of the drawings, in order to bring the stopsinto proper cooperative relation with the three lines of tail stops :20and 21 of the keys. The upper or rear stops on the stop slides 86,instead of being upwardly projecting lugs or ears as at 87, arepreferably shoulders 95 and 96 on a folded-over angle projection on thestop slides, as will be seen in Figs. 1 and 6 of the drawings. Thisconstruction allows for a more compact arrangement between operatinparts of the machine.

In or er to guide and insure movement parallel to the stop slides 86with which they are slidably connected, the forward ends of the links 8tare preferablyprovided with depending arms or lugs 97,engaging slots 98in a comb plate 99, secured at the front of the machine. The dependinglugs 97 are preferably adapted to cooperate with a universal bail 101,provided with rock arms 102 pivotally mounted upon a'shaft 103 extendintransversely of the machine near the bottom thereof and su ported in theside frame plates 5 and 6, as r own in Fig. 1. A spring 102 connected tothe comb plate 99 and to one of the rock arms 102 tends to hold the bailforward against the depending lugs 97. The operation of the bail 101 isfully set forth in my application, Serial No. 50,219, and need not bedescribed herein. It will be seen that the stop slides 86 are mounted inthe machine at an angle of about 30 to the horizontal, so as to slide inparallel relation to the underside of the keyboard unit, the stop lugs87 being adapted to clear the tails or stop ends of the keys when thekeys are in normal retracted position.

When the zero keysare depressed the stop fingers 21 are set directlyforward of the stop lugs 87 on the extreme forward ends of the stopslides 86, and are in position to block any movement of the stop slides86 and the adding sectors. The detent dogs 72 will be lifted, however,and the type segments will be moved forward one space by springs 82 tobring the zeros on the type segments into printing position. Thismovement of the type segment is permitted by the pin and slot connection80-81 between the type segments and the adding sectors 79, and takesplace when the handle is rotated in the usual manner for the adding andprinting operation.

What I claim is:

1. In a key-set adding machine, a keyboard comprising a row ,of keys; azero key in said row; key stems formed with stop fingers; adepressed-key latch strip associated with said row of keys; a detent dogpivoted atthe rear end of the latch strip and normally preventingmovement of the associated adding sector and type segment; a springyieldingly holding said detent dog in engagement with the latch strip,and said strip normally holding the said detent dog in operativeposition to prevent movement of the adding sector and type segment andpermitting said dog to rise above the adding sector and type -se mentstop when the latch strip is move forwardly; a stop slide connected tothe adding sector; means whereby when the zero key is depressed thelatch strip is moved forward to release the detent dog,

and the stop slide and its connected adding sector is heldagainstmovement, the assooiated type segment being released from the detentdog; and means to permit the released type segment to move a single typespace to place the zero type in printing position without movement ofthe adding sector.

2. In a key set adding machine, a keyboard mounted in the main frame; aplurality of rows of keys provided with stems slidably mounted in thekeyboard; a depressed-key latch strip in said keyboard and associatedwith each row of keys; said latch strips being provided with lookingnotches in their upper edges near their rear ends; a locking bailextending across the tops of the latch strips; means for pivotallymounting said bail whereby it may drop into and be lifted out of thelocking notches in the latch strips, said notches being considerablywider than the thickness of the locking bail whereby the notches of allof the latch strips will be in register to receive the locking bailregardless of whether keys are depressed in all of the rows.

3. In a key set addin machine, a keyboard mounted in the main frame; aplurality of rows of keys provided with stems slidably mounted in thekeyboard; a depressed key latch strip in said keyboard and associatedwith each row of keys; said latch strips being provided with lockingnotches; a locking bail extending across the latch strips; means forpivotally mounting said bail whereby it may move into and be moved outof the locking notches in the latch strips, said notches beingconsiderably wider than the thickness of the locking bail whereby thenotches of all of the latch strips will be in register to receive thelocking bail regardless of whether keys are depressed in all of therows.

4. In a key-set adding machine, a keyboard unit comprising a rectangularbox-like subframe supporting a row of keys and adapted to be placed inthe main frame of the machine; a latch strip for said row of keysslidably mounted in the sub-frame and arranged for holding keys indepressed position; a universal rocking bail pivotally supported on therear of said sub-frame for cooperation with the rear end of said latchstrip; a second bail pivotally mounted on the universal rocking bail andprovided with a tappet arm adapted to be actuated by handle-operatedmechanism for operating said universal bail to move the latch stri andthereby release a depressed key upon the return stroke of the handle;and a manually, operable lever pivotally mounted on said universal bailin position to cooperate both with said universal bail and with said tapet member, the arrangement being such t at moving said lever in onedirection swings the said universal bail to operate said latch strip torelease a depressed key and moving it in the other dlrection moves saidsecond bail and the tappet member to throw and lock the tappet out ofoperative position, to thereby permit repeat operations by preventingrelease of a depressed key by the handle operations.

5. In a key-set adding machine, a keyboard supportin a row of ke s; alatch strip for said row 0 keys slidably mounted for fore-and-aftmovement and arranged for holding keys in depressed position; auniversal rocking ball pivotally supported at the rear of said keyboardfor cooperation with key upon the return stroke or the handle;

o erable lever pivotally and a manuall mounted on sea un versal bail inposition to coo erate both with said universal bail and wit being suchthat moving said lever forward swings the said universal bail to o'erate' said latch strip to release a depres'se key and moving itrearward moves said second ball and the tappet memberto throw and lockthe tappet out of gperative position, to thereby ermit repeat operationsby preventing reease of a depressed key by the handle operations.

6. In a key-set adding machine, a keyboard comprising a row of keys; keystems formed with stop fingers; a depressed-key latch strip associatedwith said row of ke s; a a

detent dog pivoted at the rear end 0 the latch strip and normallypreventing movement of the associated adding sector'and type segment; aspring yieldingly holding said detent dog in engagement with ,the latchstrip, and said strip normally holding the said .detent dog in operativeposition to prevent movement of the adding sector and type segment andpermitting said dog to rise above the adding sector and type segmentstop when the latch strip is moved forwardly; a

stop slide connected to the adding sector; 1

means whereby when a key is depressed the latch strip is moved forwardto' release the detent dog, and the stop slide and its connected addingsector is free to move an extent determined by the depressed key, theassociated type segment being released from thedetent dog; and means topermit the released type segment to move-a single typespace- Y before itmoves with the adding sector.

, 7. In a key-setadding machine, the combination with a main frame; akeboard 'umt 1n said frame and carrym keys avlng stop fingers at theirlower en s; a pair of rods below the keyboard; a stop bar slidablymounted upon said rods and extending foreand-aft of the keyboard, saidstop bar being I provided near its front and rear ends with elongatedslots cooperatin with the said rods; sto lugs form'edon t e upper edgeof said sto ar a link connected at its rear-end .to'an a ding sector; apin and slot connection betwen the forward end of said link and theforward end of the stop bar; and a spring connected to the stog e stopbar and link to; f

bar and to the link for normally holding t move in unison but adapted,to permit an insignature.

terruption of the return movement of the stop i a bar while the link andadding sector are being restored to normal position.

In testimony, whereof I hereunto afix'my GLENN-"J. BARRETT.

said tappet member the arrangement

